正夫/柳刃 Shobu / Yanagiba (Sashimi Knife)
Shobu or Yanagiba are the formal names for the Sashimi knife. These long, slender blades are specifically crafted for slicing (pull-cutting) raw fish into beautiful sashimi pieces.
主に生の魚を刺身にする（引く）ために使う「刺身包丁」の正式名称です。